— 435 — 
fission of this sheath at later stage, the division being usually in two 
opposite linear-oval plurinervate members or groups though some- 
times the larger divisions become, in part at least, split into individual 
linear, uninervate, spreading leaves. In the multinervate divisions 
the nerves converge in passing to the apex. 
The stem of Schizoneura is similar to that of Asterophylites, 
though the ribs are said usually not alternate at the nodes. It is 
doubtful if it can in many cases be distinguished from the branch of 
Phyllotheca. The essential details of the fertile spike which is ter- 
minal, have not yet been made known. 
So far as known, Schizoneura was, in Permo-Carboniferous time, 
confined to the lower Gondwana floral province; but in the Trias 
the genus became cosmopolitan. 
Schizoneura? sp. 
Pl. V, Fig. 6. 
The slender stem fragment shown in the Photograph, Pl. V, 
Fig. 6, is tentatively and with much doubt placed in this genus only 
on account of its clsse agreement with similar stems from other 
regions of the Southern flora (1) found either in union with the leaves 
or the genus or in such association and with such agreement of cha- 
racters as to warrant their reference to the same generic type. Our 
specimen presents five nodes at intervals of about 1.5 em, the upper 
internodes being shorter. It is ten ribs in width at the lowest node. The 
ribs are relatively broad, rather flat, and in some instances alternate at 
the nodes though in most cases they are continuous in position. The 
aspect of the flattened stem, which is not enlarged at the nodes, sug- 
gests a slightly thickened cylinder. Lineate moulds bordered on 
each side by fine lines mark the passage of the canals. The rounded 
leaf scars are narrower than the ribs and inconspicuous. 
The fragment in hand offers no characters by which to differen- 
tiate it from Annularia or Asterophyllites. Even the prevailing con- 
tinuity of the costation at the nodes is of little weight. The leaf 
tubercles of the North American stems, described by Lesquereux as 
(1) Sce Feistmantel, Fl, Gondwana Syst., v. 4. IM pt. 2, pl. iv A-pl. viii A. 
